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B1640 02 A short to ground is detected on the mirror heating element supply voltage circuit while the Action Taken When the DTC Sets The affected heated mirror will not be activated. Conditions for Clearing the DTC A current DTC will clear when the fault is no longer present. A history DTC will clear after 40 malfunction-free ignition cycles. Reference Information Schematic Reference Outside Rearview Mirror Schematics Connector End View Reference Component Connector End Views Description and Operation Outside Mirror Description and Operation (Heated Mirrors) or Outside Mirror Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool References Control Module References For Scan Tool Information. Circuit/System Verification
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Mirrors - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Ignition ON, press the rear window defogger switch. The rear window defogger and both heated Circuit/System Testing 1. Ignition OFF, disconnect the harness connector X3 at the appropriate door switch. 2. Ignition ON, verify a test lamp does not illuminate between the supply voltage circuit terminal 7 and ground. If the test lamp illuminates, test the supply voltage circuit for a short to voltage. 3. Ignition OFF, test for infinite resistance between the supply voltage circuit terminal 7 and ground. If less than the specified value, test the supply voltage circuit for a short to ground. If 4. Test for 5-10 ohms of resistance between the supply voltage circuit terminal 7 and the low reference circuit terminal 3. If not within the specified range, test the supply voltage circuit and the low reference 5. If all circuits test normal, test or replace the appropriate door switch. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Outside Rearview Mirror Glass Replacement Control Module References for DDS or PDS replacement, setup and programming DTC B1722 Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptors DTC B1722 01 Mirror Power Fold Circuit Short to Battery
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Mirrors - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
DTC B1722 02 Mirror Power Fold Circuit Short to Ground DTC B1722 04 Mirror Power Fold Circuit Open Diagnostic Fault Information Circuit/System Description The Driver Door Switch (DDS) and Passenger Door Switch (PDS) control the power folding or Conditions for Running the DTC Mirror folding is requested. Conditions for Setting the DTC An improper voltage level is seen on either the folding mirror motor retract control circuit or the Action Taken When the DTC Sets Power folding mirror operations are suspended so long as the fault is present. Conditions for Clearing the DTC A current DTC will clear when the fault is no longer present. A history DTC will clear after 40 malfunction-free ignition cycles. Reference Information Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Folding Mirror Motor Retract B1722 02 B1722 04 B1722 01 - Folding Mirror Motor Extend B1722 02 B1722 04 B1722 01 -
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Mirrors - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Schematic Reference Outside Rearview Mirror Schematics Connector End View Reference Component Connector End Views Description and Operation Outside Mirror Description and Operation (Heated Mirrors) or Outside Mirror Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool References Control Module References For Scan Tool Information. Circuit/System Verification Ignition ON, using the folding mirror switch, the left and right rearview mirrors should extend Circuit/System Testing 1. Ignition OFF, disconnect the harness connector X7 at the appropriate door switch. 2. Ignition ON, verify a test lamp does not illuminate between the following circuit terminals and ground: Control circuit terminal 1 Control circuit terminal 2 If the test lamp illuminates, test the appropriate circuit for a short to voltage. 3. Ignition OFF, test for infinite resistance between the following circuits and ground: Control circuit terminal 1
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Mirrors - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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